package com.esoon.cdms.menu.action.whereusedinproject;  
 
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;

import javax.swing.JCheckBox;
import javax.swing.JPanel;
import javax.swing.JTree;
import javax.swing.UIManager;
import javax.swing.plaf.ColorUIResource;
import javax.swing.tree.TreeCellRenderer;
 
public class CheckBoxTreeCellRenderer extends JPanel implements TreeCellRenderer  
{  
    protected JCheckBox check;  
    protected CheckBoxTreeLabel label;  
      
    public CheckBoxTreeCellRenderer()  
    {  
        setLayout(null);  
        add(check = new JCheckBox());  
        add(label = new CheckBoxTreeLabel());  
        check.setBackground(UIManager.getColor("Tree.textBackground"));  
        label.setForeground(UIManager.getColor("Tree.textForeground"));  
    }  
      
    /**  
     * 返回的是一个<code>JPanel</code>对象，该对象中包含一个<code>JCheckBox</code>对象  
     * 和一个<code>JLabel</code>对象。并且根据每个结点是否被选中来决定<code>JCheckBox</code>  
     * 是否被选中。  
     */ 
    @Override 
    public Component getTreeCellRendererComponent(JTree tree, Object value,  
            boolean selected, boolean expanded, boolean leaf, int row,  
            boolean hasFocus)  
    {  
        String stringValue = tree.convertValueToText(value, selected, expanded, leaf, row, hasFocus);  
        setEnabled(tree.isEnabled());  
        check.setSelected(((CheckBoxTreeNode)value).isSelected());  
        label.setFont(tree.getFont());  
        label.setText(stringValue);  
        label.setSelected(selected);  
        label.setFocus(hasFocus);  
        if(leaf)  
            label.setIcon(UIManager.getIcon("Tree.leafIcon"));  
        else if(expanded)  
            label.setIcon(UIManager.getIcon("Tree.openIcon"));  
        else 
            label.setIcon(UIManager.getIcon("Tree.closedIcon"));  
              
        return this;  
    }  
 
    @Override 
    public Dimension getPreferredSize()  
    {  
        Dimension dCheck = check.getPreferredSize();  
        Dimension dLabel = label.getPreferredSize();  
        return new Dimension(dCheck.width + dLabel.width, dCheck.height < dLabel.height ? dLabel.height: dCheck.height);  
    }  
      
    @Override 
    public void doLayout()  
    {  
        Dimension dCheck = check.getPreferredSize();  
        Dimension dLabel = label.getPreferredSize();  
        int yCheck = 0;  
        int yLabel = 0;  
        if(dCheck.height < dLabel.height)  
            yCheck = (dLabel.height - dCheck.height) / 2;  
        else 
            yLabel = (dCheck.height - dLabel.height) / 2;  
        check.setLocation(0, yCheck);  
        check.setBounds(0, yCheck, dCheck.width, dCheck.height);  
        label.setLocation(dCheck.width, yLabel);  
        label.setBounds(dCheck.width, yLabel, dLabel.width, dLabel.height);  
    }  
      
    @Override 
    public void setBackground(Color color)  
    {  
        if(color instanceof ColorUIResource)  
            color = null;  
        super.setBackground(color);  
    }  
} 